After 30 seconds half is left. After 30 more seconds, half of that much will be left (25%) or 1/4 of the original amount
Work = force * distance
force = 200 N
distance = 2m
Work = 200 * 2 = 400 J of work done.
Nicolaus copernicus was a renaissance-era mathematician and astronomer who formulated a model of the universe that placed the sun rather than the earth at the center of the universe , in all likelihood indepently of aristarchus of samos who had formulated such a model some eighteen centuries earlier.
Answer:
An object in equilibrium has a net force of zero
Static equilibrium describes an object at rest having equal and balanced forces acting upon it.
Dynamic equilibrium describes an object in motion having equal and balanced forces acting upon it.
Explanation:
An object is said to be in equilibrium when a net force of zero is acting on it. When this condition occurs, the object will have zero acceleration, according to Newton's second law:

where F is the net force, m the mass of the object, a the acceleration. Since F=0, then a=0. As a result, we have two possible situations:
- If the object was at rest, then it will keep its state of rest. In this case, we talk about static equilibrium.
- If the object was moving, it will keep moving with constant velocity. In this case, we talk about dynamic equilibrium.
I looked it up and here's what it said
To balance the charge of 80 protons this atom has<u> </u><u><em>a cloud of 80</em></u><em> </em>electrons spinning around its nucleus.